<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
<style>
    *{
        margin: 0;
        padding: 0;
    }
    .b1,.b3{
        height: 50px;
        background-color: yellow;
    }
    .b2{
   
        background:red;
        overflow:hidden;
        
        height: 500px;
    }
    li{
        height: 100px;
    }
</style>
</head>
<body>
    <div class="b1"></div>
    <div class="b2">
        <ul>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
            <li>1111111111111111</li>
        </ul>
    </div>
    <div class="b3"></div>
</body>
</html>